1. Lifetime abstainers had fewer than 12 drinks in their lifetime. Former drinkers had at least 12 drinks in their lifetime and none in the past year. Former infrequent drinkers are former drinkers who had fewer than 12 drinks in any one year. Former regular drinkers are former drinkers who had at least 12 drinks in any one year. Current drinkers had 12 drinks in their lifetime and at least one drink in the past year. Current infrequent drinkers are current drinkers who had fewer than 12 drinks in the past year. Current regular drinkers are current drinkers who had at least 12 drinks in the past year.

2. Level of alcohol consumption categories are defined as follows: light drinkers, up to 3 drinks per week; moderate drinkers, 4–14 drinks per week for men and 4–7 drinks per week for women; heavier drinkers, more than 14 drinks per week for men and more than 7 drinks per week for women.

Source: Centers for Disease Control and Prevention, Health, United States, 2002.